Circuits made of concrete [#electronics]

We Could Use Cement Circuits in Gadgets Someday"The study, which appeared in The Proceeding of the National Academy of Sciences and was accompanied by some inspiring photoshop art (see below), describes the process of heating a cement compound to 2,000 degrees Celsius. Using aerodynamic levitation, which lifts materials off of a surface using gas pressure, the team was able to carefully control the way the cement cooled. The result of the superheating? A glassy surface that can “trap” free electrons—the things needed to conduct electricity." via Gizmodo